No delegateCommandHandler for vscode.java.validateLaunchConfig — unable to launch any Java application

[leo-tronic]

[github-actions]

Hi @leo-tronic, I'm an AI Support assistant here to help with your issue. While the team reviews your request, I wanted to provide some possible tips and documentation that might help you in the meantime.

• This issue is tracked upstream: Adapter descriptor ERROR “No delegateCommandHandler for vscode.java.validateLaunchConfig”
  • URL: Adapter descriptor ERROR "No delegateCommandHandler for vscode.java.validateLaunchConfig" #1448
  • Description: Same error when launching or validating launch.json. No workaround posted yet; you can subscribe there for updates.

Suggestions to try in the meantime:

• Verify both “Language Support for Java” (redhat.java) and “Debugger for Java” (vscjava.vscode-java-debug) are activated in your workspace: run Developer: Show Running Extensions and confirm they’re enabled.
• Ensure the workspace is trusted (untrusted workspaces disable debug APIs).
• Reinstall the Java Extension Pack, then reload VS Code.
• Clear extension state: run Java: Clean the Java language server workspace, restart, and check for errors in Output → Language Support for Java.
• Enable verbose debug logs by adding to your settings:

  "java.trace.server": "verbose"

  then inspect the Debug Console and Developer Tools console for errors.

Other references with low confidence

- No delegateCommandHandler for vscode.java.startDebugSession (attach debugger fails) https://github.com//issues/728 - No delegateCommandHandler for vscode.java.resolveMainMethod (error on F5) https://github.com//issues/1342 - No delegateCommandHandler for vscode.java.test.get.testpath / findJavaProjects (Java Test extension) https://github.com/microsoft/vscode-java-test/issues/1681

The team will respond to your issue shortly. I hope these suggestions are helpful in the meantime. If this comment helped you, please give it a 👍. If the suggestion was not helpful or incorrect, please give it a 👎. Your feedback helps us improve!

[leo-tronic]

I ended up downgrading Java debug versions into it worked. It took a few tries.

For better devex, it would be an improvement if the newer versions worked out of the box. Maybe a simple integration test to confirm the above Java app runs successfully without errors?